The marine electronic plate consists of a C size 1.5'' TPU ball connected to a 6.25" x 2" rectangle plate. The rectangle plate features 20 pre-drilled holes will match many electronic devices and mounts, including marine fish finders and GPS chartplotters, CB radios, Ham radios, gimbal brackets, and more | NOTE: This plate is a universal mounting bracket with a variety of mounting hole locations. In some applications, additional holes may need to be drilled to properly fit your electronics | The rectangular plate made of 6061-T6 aluminum alloy material with CNC machining and iii grade hard anodized surface for durability and reliability in the most demanding environments. TPU over-molded ball head, anti-slip and wear-resistant | The 1.5'' ball square plate compatible with RAM Mounts 1.5'' C size ball double socket arms. Work for other devices with 1.5 inch swivel ball mounting pattern | Compatible with GPS Chartplotters and Fishfinders: GPSMAP 722, GPSMAP 722xs, GPSMAP 742, GPSMAP 742xs; Striker Plus 5cv, Striker Plus 7cv, Striker Plus 7sv; ECHOMAP Plus 72cv, ECHOMAP Plus 73cv, ECHOMAP Plus 74cv, ECHOMAP Plus 75cv, ECHOMAP Plus 77cv | Compatible with Lowrance GPS Chartplotters and Fishfinders: HDS Carbon 7, HDS LIVE 7, Hook Reveal 7 Series, Hook Reveal 9 Series